They sure are cute. Must use elastic thread with ribbon yarn. I would love to try the pattern too if anyone has one.

I remembered that I had one - not the same but probably a good start.

Here is a link that might be useful: Talking Crochet -Baby Garden Headbands

here's another at the end of the poncho pattern

Here is a link that might be useful: Baby Short Round Poncho & Headband

I forgot to mention ..... what yarn or ribbon would stretch like that? Thanks!

Those are ADORABLE! I just finished knitting a headband using a stretchy yarn and it turned out cute. I might try using that pattern and just make it smaller for a baby. Thanks for the idea!
Here is a link to the patten I used.

Here is a link that might be useful: Lace Headbands

it is not necessarily the yarn/ribbon that streches but the stitch that you use